Rotary combustion-engine.



0.1i. TANGBMAN. ROTARY coMBUsToN ENGINE.

APPLIUATIOH FILED APB.. 26, 1910. ggpgg?, Patented; @1229, w13.

3 SHEETS-SHEET 1.

C. H. TANGBMAN. ROTARY GOMBUSTION ENGINE. APPLICATIONPILED APR. 26, 1910.

Patented Apr.. 2.9, 1913..

3 SHEETS-SHEET 2.

CORNELIUS H. TANGEMAN, QF NEW YORK, N. Y.

RGTARY COMBUSTION-ENGINE.

Specification of Letters Patent.

Patented Apr. 29, 115i 3.

pplication filed April 2G, 1910. Serial No. 557,823.

.To all whom 'it may concern Be it known that l', CORNELIUS H. Tanon MAN, a citizen of thc United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Rctary Combustion-Engines, ot which the' follewin@t is a full, clear, and exact specification.

This invention relates .to combustion en gines, and has especial reference to the prof vision of a four-stroke engine wherein the working and scavenging strokes of the piston will be greater than the suction and compression strokes in order tosecure increased economy.

The object of the invention is to provide a piston engine in which the suction and compression strokes will be relatively short A,as compared with the working and scavenging strokes,'thereby permitting a greater expansion of the charge than is possible in engines as usually constructed, also to provide that the scavenging stroke will be,

longer than the working stroke, thereby permitting the compression clearance space to be positively scavenged, and also a rapid power stroke thereby minimizing the loss of heat through the cylinder walls.

As herein shown, the invention is embodied in an engine of the rotary type, comprising one or more cylinders mounted to rotate relatively to an eccentric moving abutment or crank shaft. connected to thed piston, at such a ratio that in one revohb tion of the cylinder the petten makes four strokes of different lengths, as above described. This result is effected by gearing the cylinders and eccentric abutment to gether to rotate simultaneously, so that at each quarter revolution of the cylinder, the piston makes a complete stroke, varying in length according to the relation of the abutment and the cylinder during such stroke.

A further feature of the invention resides in the provision of means for securing a longer exhaust stroke than working stroke by ofsett-ing the axis of the rotatable abutment toward the exhaust portion of the are of the cylinder.'

Further objects-of the invention relate to the general arrangement and details ot construction, which will be more fully understood. in connection with the description of the accompanying drawings, wherein- Figure 1 is la"longitudinal section of a multiple cylinder engine embodying the invention, 2 is a cross-section, and Fig. 3 is a 'diagrammatic view showing the po sitions of the piston during a complete four-stroke cycle.

1, 1 represent the stationary trame of the engine, in which is journaled in bearings 2, 3, a rotary casing 4, on which are mounted one or more cylinders As herein shown, three '(or a multiple thereof) cylinders have the piston rods connected to a common crank, and a tour-stroke cycle per revolution produced, provided the ratio of revolution of the crank and cylinder be predetermined so that the crank will make three complete revolutions while the cylinder makes one revolution, thereby producing a four-stroke cycle for each cylinder revolution. In order to accomplish this, the ra tio ot revolution is made 3 to 1, that is, for every revolution of the cylinder thc crank shaft will make three revolutions in the same direction.

Each cylinder 5 contains a piston 8 having a connect-ing rod 9 connected to crank pin 10 carried by a crank shaft 1], which is eccentric to the axis of rotation ot the cylinders 5 and casing 4. The crank shaft 11 is journaled in bearings 12, and 13 is a starting handle. Gn the shaft 11 is a gear 14 which meshes with an internal gear 15 on the casing 4. The casing 4 is connected to the main shaft 1G, which is made hollow at 17 and connected with a gas in-take pipe 18. The gas passes from the pipe 18 through the hollow shaft 17 to the interior of the casing 4 and passes into the tiring chambers 19 through check valves 20 in the pistons.

21 is a mechanically operated exhaust valve mounted on rod 22 and operated by a staticiary cani :23 carried on the frame 1.

her methods for supplying and coni gases can be used without departing from the scope ot the invention.

3 shows diagrammatically the positions o one piston vand crank at each quarter remlution, the others having positions corresponding to their angular displacement. Starting with the piston 8 at its nearest position to the cylinder' head marked 8, the

25 y thev exhaust stroke. vIn orderv to further crank will bein the position' marked 10a. The piston will move in the direction of the arrow throughthe quadrant marked Suction, at the end Iof which the4 piston will vhave come to the position 8b and the crank to the position 110. During th'enext quadrant, marked Compression the piston will .go tothe positionfc and the crank to the V-posit-ion' 10C, while during the next quadrant marked V Working fthe piston will go to 'the position marked 8d and the crank to the'.position 10d. During the last or exhaust stroke, the piston will go back to lthe position 8 and the crank from 10d lengthen the exhaust stroke, so as to more completely Vscavenge the'compression space near the cylinder head, the center of the "plaft 1l may be offset slightly, as shown in gs. 2 and 3. This offset'is made toward the end of the exhaust qu-adrantLso that the crank at position 10a comes ,nearer the cylinder head than at posit-ion 10. This offsetting to secure a longer exhaust stroke of the piston causes a somewhat shorter compression stroke, but an advantage is obtained in that the ent-ire cylinder space is practically cleared'by the long exhaust stroke of the piston. By not oHsetting the crank Ashaft 11, the exhaust stroke would not be quite as long, while the working and suction strokes would be practically the same as` before.

Various modifications and changes in the specific construction shown may be made.

without departing from the scope of the invention. v

It will be seen that I have provided a construction wherein greater economy and eiliciency will be secured by means of a long working stroke, while also permitting more complete scavenging during the exhaust stroke than is commonly t-he case. Also, it will be seen that I have provided what might be called a four-stroke cycle engine, inasmuch as in `'one revolution of the cylinder the piston makes four strokes, thereby securing more frequent power impulses. Furthermore, the arrangement herein described comprising a plurality of pistons act-ing on a common crank, is balanced, and no flywheel is essential, while the number of cylinders having their pistons connected to a single crank may be varied as desired.

1 rotating 90.

Y Having thus described my invention, I I declare that what I claim as new and desire to secure by LettersPatent, is

l. The comb'nation with a rotatable cylinder, and a pistonreciprocating therein, of a crankshaft mounted eccentri'cally with respect to' the axis of revolution of the cylinder, a' connecting rod between the crank shaft and the piston, and mechanical connections between the cylinder and the crank shaft for rotating the crank shaft at such a rate of revolution greater than that of the cylinder as to cause the piston to make a full stroke in the cylinder while the cylinder'is 2. The combination with a rotatable cylinder, and a piston reciprocating therein, of

inder, a connecting rod between the crank shaft and the piston, and gearing between the cylinder and the crank shaft causing one stroke of the piston in the cylinder while the cylinder rotates 90o and the crank shaft 270.

3. The combination with a rotatable vcylinder, and a piston reciprocating in said cylinder, of a crank shaft mounted in stationary bearings eccentric to the axis of rotation of said cylinder, and gearing between the crank shaft and cylinder causing the piston to make one full stroke while the cylinder` makes a quarter revolution.,` A

4'. The combination with a rotatable cylinder and a piston reciprocating therein, of a rotatable crank shaft mounted eccentrically with respect to the axis of rotation of the cylinder, gearing connecting the crank shaft ,and the cylinder for rotating the crank shaft at such rate of revolution greater than that of the cylinder as to cause the piston to make four strokes during one revolution of the cylinder, the crank shaft being located in such position as to make a i predetermined one of said four piston strokes longer than the others.

5. In a four stroke cycle engine, the com; bination with a cylinder, a piston, a crank shaft and a connecting rod between said crank shaft and said piston, of valve mechavnism controlling the inlet compression, iiring and exhaust of the gas with respect to corresponding piston strokes, and means for causing a predetermined one ofsaid piston strokes of each cycle to be longer than the other strokes of that cycle.

6; In a four stroke cycle engine, the combination with a rotatable cylinder, a piston, a crank shaft and a connecting rod between said crankshaft and said piston,- of valve mechanism controlling the inlet, compression, firing and exhaust of the gas with respect to corresponding piston strokes and means comprislng crank shaft and said rotatable cylinder for gearing connecting the .a crankshaft mounted eccentrically with -respect to the axis of revolution of the cyl- 

